private QRect targetRect()
{
QRect result = new QRect(0, 0, 20, 10);
result.MoveCenter(new QPoint(target.X(), Height() - 1 - target.Y()));
return result;
}
private QRect shotRect()
{
const double gravity = 4;
double time = timerCount / 20.0;
double velocity = shootForce;
double radians = shootAngle * 3.14159265 / 180;
double velx = velocity * Math.Cos(radians);
double vely = velocity * Math.Sin(radians);
double x0 = (barrelRect.Right() + 5) * Math.Cos(radians);
double y0 = (barrelRect.Right() + 5) * Math.Sin(radians);
double x = x0 + velx * time;
double y = y0 + vely * time - 0.5 * gravity * time * time;
QRect result = new QRect(0, 0, 6, 6);
result.MoveCenter(new QPoint((int) Math.Round(x), Height() - 1 - (int) Math.Round(y)));
return result;
}